Fig 2.

Descriptive univariate correlations between imaging and EEG variables and delirium severity. (a) Across the whole cohort, there is no correlation between delirium severity (peak DRS) and mean cortical thickness (n=86). (b) When divided by delirium status, a significant negative correlation is noted between delirium severity (peak DRS) and mean cortical thickness (n=86). (c) Postoperative delta power correlates with mean cortical thickness in the MRI+EEG cohort (n=54) with (d) similar relationships evident in PD and PND (n=54). (e) Topographic plot showing the scalp-based correlations of postoperative delta power and mean cortical thickness. Across the MRI+EEG cohort, postoperative delta power correlates with mean cortical thickness across the entire scalp using threshold-free cluster enhancement for multiple comparison across electrodes. White dot signifies a significant electrode. (f) Data from panels (b) and (d) were plotted in three dimensions to give an index of the influence of the different parameters. To orient the reader to the 3D space, the edges of the regression planes in panel (f) nearest the reader have been outlined in black, whereas the edges receding into the page have been left plain. DRS, Delirium Severity Rating Scale-98; PD, patients who developed delirium; PND, patients who did not develop delirium.